Er.Mahesh Thapa Magar

Wireless power transfer ( WPT ) or  wireless energy transmission  is the transmission of  electrical energy  from a power source to an  electrical load , such as an  electrical power grid  or a consuming device, without the use of discrete man-made conductors. Wireless power is a generic term that refers to a number of different power transmission technologies that use time-varying  electric , magnetic , or  electromagnetic fields . In wireless power transfer, a wireless transmitter connected to a power source conveys the field energy across an intervening space to one or more receivers, where it is converted back to an electrical current and then utilized. Wireless transmission is useful to power electrical devices in cases where interconnecting  wires  are inconvenient, hazardous, or are not possible. Wireless power techniques fall into two categories, non-radiative and radiative. In  non-radiative  techniques, power is typically transferred by  magnetic fields  using  magnetic

UMTS (Universal Mobile Telecommunications System) is a so-called "third-generation (3G)," broadband  ,  packet  -based transmission of text, digitized voice, video, and multimedia at data rates up to and possibly higher than 2 megabits per second (  Mbps  ), offering a consistent set of services to mobile computer and phone users no matter where they are located in the world. Based on the Global System for Mobile (  GSM  ) communication standard, UMTS, endorsed by major standards bodies and manufacturers, is the planned standard for mobile users around the world by 2002. Once UMTS is fully implemented, computer and phone users can be constantly attached to the Internet as they travel and, as they  roaming service  , have the same set of capabilities no matter where they travel to. Users will have access through a combination of terrestrial  wireless  and  satellite transmissions. Until UMTS is fully implemented, users can have multi-mode devices that switch to the currently